Step 5 Preview
Model idstep-5-preview
Price$1 in, $2.70 out per 1M tokens
Checked15 October 2026
No published training cutoff
At least1,442events since its release on 20 September 2026
59 historic, 308 major. 54 days of news.
StepFun doesn’t publish a training cutoff, so we count from its release date. The real gap is larger.
How to call it
6 ways to use Step 5 Preview, with the model id each provider expects.
| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| StepFun API | step-5-preview |
platform.stepfun.ai | |
| OpenRouter | stepfun/step-5-preview |
openrouter.ai | |
| Hugging Face | huggingface.co | ||
| Hugging Face (BF16) | huggingface.co | ||
| Hugging Face (NVFP4) | huggingface.co | ||
| ModelScope | modelscope.ai |
Pricing
| Input | $1 per 1M tokens |
|---|---|
| Cached input | $0.10 per 1M tokens |
| Output | $2.70 per 1M tokens |
As published: “per 1M tokens (USD); reasoning tokens billed as output”.
Source: platform.stepfun.ai, checked 15 October 2026.
Specs
- Input
- Text, images and video
- Output
- Text
- Context window
- 1,000,000 tokens
- Max output
- 64,000 tokens
- Open weights
- Yes
- Licence
- stepfun-model-license-1.0
- Training cutoff
- Not published
- Released
- 20 September 2026
- Status
- Preview
- Type
- Reasoning model
What stands out
What its maker marketed at launch, and what people found later, each with its source.
600B sparse MoE agent model with 1M context and video input
600B total / 27B active, 92 layers; up to 60 images and short videos per request; reasoning effort low/medium/high.
Notes
Open weights published on 2026-10-15 as promised (FP8, BF16, NVFP4 on Hugging Face; StepFun Model License 1.0: Apache-style, but device makers and MaaS providers over $20M revenue need a commercial licence, attribution above 100M MAU / $20M monthly revenue, and models trained materially on its outputs count as derivatives; see entry StepFun releases Step 5 Preview open weights). Self-hosting: FP8 on 4x B300 or 8x H200; BF16 on 8x B300 or 16x H200 (model card). Pricing verified on StepFun’s own pricing page on 2026-10-13: $1.00 input (cache miss, includes the cache write), $0.10 cache hit, $2.70 output (launch press had reported $0.05 for cache hits). OpenRouter lists it since 2026-10-08 at $1.00 / $2.70 with 1M context and 64k max output. Free and exclusive in Tencent WorkBuddy from Oct 12 to Oct 25, 2026 (Pandaily, citing IT Home).